Many thanks for your reply, Spence.
Coin 1 (pierced) is 14 to 16 mm across.
Coin 6 (with the cross) is 19 mm dia. Comparing it to online images of Elizabeth I threepennies, I can begin to see a quadrant of the crest on the reverse and perhaps the hint of a head on the obverse - but maybe this is the power of suggestion!
Coin 10 (with the crest) is 11 to 14 mm across. I'm fairly sure now that it is a denar, Hungary, possibly Ferdinand II (early 17thC)
Each of them is less than 0.25 mm thick.